据气体世界网2022年5月30日东京报道，日本东京都市大学的研究人员日前开发出了一种新的直接空气捕获（DAC）碳捕获技术，据称这个技术在去除大气中浓度较低的有害气体时，效率可达到99%。
由于全球能源市场继续推进可持续替代能源的发展，以帮助减少大气中二氧化碳，碳捕获技术被视为降低排放的一个重要组成部分。
使用液体系统，直接空气捕获（DAC）通过化学溶液去除二氧化碳，然后使用高温将化学物质重新整合到过程中。
固体DAC技术使用吸附剂过滤器，在加热、真空下释放二氧化碳之前，用化学方法将二氧化碳结合起来，然后可以储存或使用。
这种新的高效方法在液固相分离系统中使用一种名为异氟尔酮二胺（IPDA）的化合物，以99%的效率去除大气中含有的低浓度二氧化碳。
研究过程中进行的测试表明，IPDA可以从空气中去除400ppm以上的二氧化碳的99%以上。
分散在溶液中的固体也需要加热到比其他溶液更低的温度。在60摄氏度下，捕获的二氧化碳可以被释放，恢复原来的液体。
这个技术去除大气中低浓度二氧化碳（400ppm）的速度至少是现有解决方案（如单乙醇胺）的两倍，是世界上用于指定用途的最快技术。
在完成初步研究后，东京都市大学研究人员现在可以研究如何将这项技术应用于当前的工业应用。
李峻 编译自 气体世界网
原文如下：
New carbon capture method 99% efficient
A new direct air capture (DAC) carbon capture technology being developed by researchers at Tokyo Metropolitan University is claimed to be 99% efficient at removing the harmful gas from the atmosphere when at low concentrations.
As the global energy market continues to advance development of sustainable alternatives to help reduce atmospheric carbon dioxide (CO2), carbon capture is being seen as an essential component of lowering emissions.
Using a liquid system, direct air capture (DAC) passes air through a chemical solution to remove CO2 before applying high temperatures to the reintegrate the chemicals back into the process.
Solid DAC technology uses sorbent filters to chemically bind the CO2 before being heated, placed under a vacuum, and releasing the CO2, which can then be either stored or used.
The new highly efficient method uses a compound called isophorone diamine (IPDA) in a liquid-solid phase separation system to remove CO2 at low concentrations contained in the atmosphere with 99% efficiency.
Tests conducted during the research showed that the IPDA can remove more than 99% of CO2 from the air with a concentration of 400 parts per million (ppm).
The solid dispersed in solution also required heating to a lower temperature than other solutions. At 333 K (60 celsius) the captured CO2 can be released, recovering the original liquid.
With the ability to remove low atmospheric concentrations of CO2 (400ppm) at least twice as fast as existing solutions (such as monoethanolamine), the technology is the fastest in the world for its designated purpose.
Having completed its initial research, the team can now look at how the technology may be applied to current industrial applications.
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